Liquefied petroleum gas burner



m mg was T. s. LANKFQRD- L IQUEFIED PETRODEUM ms BURNER 2 Sheets-Sheet 1 1mm June 1.1, 19641 'r RNEYs Am W66 T. s. LANKFQRD LIQUBFIED PETROLEUM GAS BURNER 2 Sheets-Sheet 2.

Filed June 11. 1964 v INVENTOR F ames igh/maven ATTORNEYS United States Patent 3,266,736 MQUEFHED PETROLEUM GAS BURNER Thomas S. Lanlrford, Box 1812, Casper, Wyn. Fitted June 11, W64, Ser. No. 374,440 13 Claims. ((32. 239-408) This invention relates to a burner for liquefied petroleum gas, and more particularly it relates to a burner embodying an improved atomizing fuel injector and air control means.

Typically, Hauck or Maxon type burners have been used to dry aggregate in rotary dryers in hot mix plants for production of road surfacing material. The fuel that is used in these burners is heavy petroleum oil which is not as satisfactory as propane or butane. These burners do have natural gas adapters and will burn propane or butane by use of an expensive vaporizer attachment. The vaporizer produces a fuel-air mixture of higher temperature and less density than the present invention in which the petroleum gas is in a liquid form at normal atmospheric temperature and vaporizes by taking heat from the surrounding air.

The first, and perhaps foremost, disadvantage in using oil is the fact that the final dried aggregate is often coated with a residue of burned oil. When the aggregate is mixed with an asphalt base oil to form the road surface, the asphalt base oil will not adhere to the aggregate coated with the residue of unburned oil. Thus, the aggregate can be loosened in the road surfacing rendering the road surfacing more susceptible to the damaging effects of use and weather. Likewise, unburned oil and oil wastes contaminate the air. Liquefied petroleum gases such as propane or butane are completely combustible and thus leave no residue on the aggregate.

In the Hauck and Maxon type burner, the mixing chamber for fuel and air is located Within the burner itself. Therefore, when liquefied petroleum gas is used with either a Hauck or Maxon type burner, the cooling of the gas on vaporization and expansion, in contact with the metal and air in the mixing chamber, will condense and freeze the moisture in the air on the metal, thereby tending to plug up openings to the mixing chamber for air. Furthermore, the frost formed on the walls decreases the efficiency of the burner.

Consequently, it is an object of this invention to avoid a freezing up of the apparatus by positioning the forward end of the fuel injector in such a manner that there is no metal nearby on which moisture can build up in the form of ice or frost. A further object is to provide an improved fuel injector apparatus having the nozzle means of the fuel injector positioned approximately coextensively with the various casing means defining air passages.

In achieving maximum efficiency of the burner, it is essential to have complete combustion which is accomplished by a complete mixing of air and fuel in the right proportion so that the mixture is neither too lean nor too rich.

In order to achieve a complete mixture of specific richness, the fuel must be evenly distributed about the valve means in a very fine spray. Thus, if the valve means is conical, as is preferred, and the nozzle means corresponds in annular configuration to a portion of the circumference of the valve means, the fuel would be distributed evenly in a 360 circle as defined by the clearance between the nozzle means and the valve means. A clearance of close tolerance, therefore, should be maintained to obtain an even distribution of fuel. This feature is not so important in a simple oil burner where the fuel, oil, is not pressurized to the extent that liquefied petroleum gas is pressurized. For instance, commercial grade butane has a pressure of 37 pounds per square inch at 100 F., and commercial grade propane has a pressure of 190 pounds per square inch at F. It will be appreciated that oil has a higher viscosity and hence the nozzle and valve will have a larger minimum clearance than is acceptable in a liquefied petroleum gas fuel injector. Furthermore, it is preferable to use stainless steel for the guide, valve means and nozzle means so as to prevent rusting which might cause an uneven flow of fuel. Moreover, some nozzles are so constructed that they can be biased to one side or another, thereby destroying the uniform fiow of fuel. For example, the nozzle may be screw threaded on the sleeve member defining the fuel passageway which would not provide a nozzle of the same rigidity as one which is formed integrally with the sleeve member.

It is still another object of this invention, therefore, to integrally connect the nozzle means to the sleeve member to prevent this biasing.

It will thus be seen that this invention provides a novel fuel injector apparatus wherein a sleeve member has disposed therein a control shaft means with a valve member secured to one end which is exactly positioned in relation to a nozzle means formed integrally on one end of the sleeve member by a guide means. The guide means has a guide core and a plurality of longitudinal ribs extending from the surface of the guide core radially outwardly with respect to its longitudinal axis and engaging the inner surface of the sleeve member defining the fuel passageway. Enasmuch as the valve means and the nozzle means have a clearance of close tolerance, it is essential to position the shaft rigidly when the valve means is a separate unit. When the valve means is integrally connected to the guide means there can be a greater shaft tolerance as the guide means, through its radial ribs, determines the clearance. It is preferable to have at least eight longitudinal ribs due to the fact that the greater the number of ribs, the more rigidly the shaft will be positioned.

While the above features of the invention will enable the fuel to be evenly distributed and the mixture of air and fuel esulting from such distribution to have a uniform richness, it is a further object of the invention to provide control means by which the primary and secondary supply of air can be controlled to determine the ultimate richness or leanness of the mixture.

Thus, in a burner having a longitudinally extending first casing means with a rear transverse end wall and an oppositely disposed forward portion terminating in a forward end, a fuel injector slidably mounted in the rear transverse end wall and positioned within the first casing means, a second casing means mounted on the fuel injector within the first casing means and extending coaxially wit-h the forward portion of the first casing means so as to form a passageway between the forward portion of the first casing means and the second casing means through which the secondary air passes, and an air inlet means communicating with the rear portion of the first casing means, it is an object of this invention to provide a lbafile means operatively associated with the second casing means and operatively positioned within the first casing means for dividing the flow of air from the air inlet through the second casing means and through the passage formed between the two casing means.

Another object is to eliminate the need of any addinonal Vaporizers with a burner of this general type.

In addition, it is an object of this invention to provide control means for positioning the baffle means so as to regulate the amount of primary and secondary air flowing through the respective passages in relation to the pressure of the fuel and the need for heat in the dryer, thus achieving better carburetion and combustion.

These and other objects of the invention are more fully explained in the following detailed description having specific reference to the attached drawings in which the preferred embodiments of the invention are depicted, not to limit the scope of the invention in any respect but so that the principles thereof may be more clearly illustrated.

In the drawings:

FIGURE 1 is a sectional elevation view showing the burner positioned for use;

FIGURE 2 is a sectional view taken substantially along the lines 2-2 of FIGURE 1;

FIGURE 3 is a sectional elevation view of the fuel injector;

FIGURE 4 is a perspective view showing the valve member integrally formed with the guide member;

FIGURE 5 is a perspective view of a modified form of the guide member;

FIGURE 6 is a sectional view taken substantially along the line 6-6 of FIGURE 4; and

FIGURE 7 is a sectional view taken substantially along the line 77 of FIGURE 5.

A burner It? is illustrated in FIGURE 1 in position for use with a rotary type dryer 12. A combustion chamber 14 is disposed at a short distance away from the burner and is connected to the dryer. Pilot lights 16 are supported on the burner at the end 18 adjacent to the combustion chamber 14 so as to ignite the fuel as it enters the combustion chamber.

More particularly, the burner includes an annular longitudinally extending first casing means 20 defining a first chamber 21, having a rear transverse end wall 22 and an oppositely disposed forward portion 24 terminating in a forward end 26. As shown in FIGURES 1 and 2, the first casing means 20 is preferably annular and has a variable diameter such that the rear portion 28 has a larger diameter than the forward portion 24, the forward and rear portions defining a transitional surface 29 therebetween. It will be understood however that it is within the scope of this invention to have a casing means of uniform diameter such that the first casing means may be an integral member as compared to the two-part member illustrated in the drawings.

An atomizing fuel injector 31, as shown in FIGURES 1 and 2, is slidably mounted, as by bushing means 33, coaxially within the chamber 21 defined by the first casing means 20. This mounting will enable the fuel injector 31 to be exactly positioned with respect to the forward end 26 of the first casing means 20. It is often desirable to place the fuel injector beyond the forward end 26 due to variances in the volume of the air supply, thus assuring better fuel air mixture.

A longitudinally extending second casing means defining a second chamber 32 is positioned, as by first support means 34, within the chamber 21 defined by the first casing means and extends coaxially with the forward portion 24 of the first casing means.

The first support means 34 comprises forward 36 and rear 38 sets of longitudinal fins which are mounted approximately parallel to the longitudinal axis of the second casing means 30. It will be appreciated, however, that either set of fins may be mounted at an angle to the axis of the. second casing means so as to create turbulence as the air flows through the second casing means. Each set of fins are rigidly secured to the outer surface of the fuel injector and the inner surface 37 of the second casing means 30. It will further be appreciated that although the second casing means is shown supported by forward and rear sets of longitudinal fins, the support means for positioning the second casing means within the first casing means may take other forms within common mechanical knowledge.

While the preferred embodiment shows that second casing means supported from the fuel injector, it will be appreciated that the second casing means could be supported from the inner surface of the first casing means in the same manner. It should be noted that as the fuel injector is slidably mounted, the second casing means will also move therewith. Consequently, any support means which secures the second casing means to the first casing means should be so designed as to allow relative movement there'between.

In the preferred embodiments shown in the drawings, the second casing means is tubular in configuration and of less diameter than the first casing means thereby being radially inwardly disposed from the inner walls of the first casing means. The first casing means and the second casing means define a passageway 40, which is annular in the preferred embodiment of the invention, therebetween.

An air inlet means 42 communicates with the rear portion of the first casing means. Any type of convention pump, not shown, may force air through the air inlet means.

A bafile means 43 is operatively associated with the second casing means 30 and operatively positioned within the first casing means 20 for dividing the flow of air from the air inlet 42 through the second casing means 30, the primary air passageway, and through the passage 40, the secondary air passageway. As illustrated, the

baffle means 43 comprises a tubular member 44 slidably positioned on the inner portion 46 of the second casing means 30 having a flaring annular surface 48 at one end 50 of the tubular member 44. Preferably the surface 48 has at least an annular area approximately equal to the cross-sectional area of the passageway 40, thus enabling the surface 48 to be moved into a position blocking the passageway 40. The surface 48 can be shifted to a position disposed from the passageway so as to allow the secondary air to pass through the passageway. As illustrated in FIGURE 1, the annular surface 48 is slightly larger than the. passageway 40 and thus is shiftable from a position seated against transitional surface 29 and a position spaced from the transitional surface 29.

It can easily be seen that the slidable range of the position of the bafile means is in part determinative of the configuration of the first casing means. Thus, the baffle means must be shiftaible into a position disposed from the passageway and opposite the air inlet means or it must be shiftable to a position disposed from the passageway and disposed within that portion, as at 28, of the first casing means which has a diameter greater than that of the passageway so that the secondary air can pass around the surface 48 and through the passageway in each case. Under the latter circumstance the surface 48 must have an outer annular diameter less than the diameter of the rear portion of the passageway so as to provide the necessary clearance for the secondary air. Of course, the construction of the first casing means and the disposed position of the annular surface may combine the alternative possibilities mentioned above, and accordingly, take the embodiment shown in FIGURE 1.

In order to impart a longitudinal movement of the baffle means 43 a control means 51 is provided comprising a crank shaft 52 journalled for rotation in the transverse end wall 22 of the first casing means 20 and having a crank shaft outer portion 54 and a crank shaft inner portion 56. A crank handle 58 is connected to the outer end 60 of the crank shaft in order to rotate the crank shaft. The inner portion 56 of the crank shaft is threadably connected to the flaring surface 48 so that the rotation of the crank shaft 52 will screw the baffle means 43 either longitudinally inwardly or longitudinally outwardly. The inner end 64 of the crank shaft is rotatably supported in bracket 66. Nuts 68 and 70 are rigidly secured to the shaft 56 on opposite sides of end wall 22 to retain the control means within the first casing means 20.

If the second casing means is supported from the first casing means, it is necessary for the tubular bafile member 44 to have longitudinal slots (not shown) therein extending from the other end 62 of the tubular member so as to receive the support means when shifted into a closed position.

As shown in FIGURE 3, the atomizing fuel injector comprises a sleeve member 72 mounted within the second casing means 30 and extending coaxially with the first casing means 20 as illustrated in FIGURE 2. The tubular sleeve member 72 has a rear transverse sleeve end wall 74 and a forward sleeve end 76 oppositely disposed therefrom. The forward sleeve end has a nozzle means 78 formed integrally therewith which extends approximately coextensively with the forward end 26 of the first casing means and with the forward end of the second casing means.

As shown, the forward ends or" the first casing means, second casing means and nozzle means extend approximately coextensively with each other so that there is no appreciable amount of metal beyond the forward end of the nozzle means to which moisture in the air could cling in the form of frost or ice. If the first casing means extends slightly beyond the fuel injector about an inch or two, the efficiency would not be appreciably affected in that ice would not form on the casing means. However, it is preferable to have the nozzle coextensive with the first casing means and likewise with the second casing means.

A fuel inlet means 80 communicates with the sleeve member '72. As shown in FIGURES 1 and 3, the fuel inlet means communicates with the sleeve memberthrough a valve 82 positioned adjacent to the rear sleeve end wall 74 of the sleeve member. In this situation it will be seen that the valve in effect forms a part of the sleeve member. It will be appreciated that the fuel inlet means could communicate with the forward portion 84 of the sleeve member within the scope of the invention. The fuel inlet means preferably has a gate valve means 85 to additionlally control the pressure of the fuel at the outlet of the fuel injector.

A longitudinal control shaft means 86 extending coaxi-ally with the sleeve member and having first 88 and second 90 end portions in positioned within the sleeve member 72. The rear or second 90 portion of the control shaft means is threada'bly journalled in the rear transverse sleeve end wall 74 and a control wheel 92 is mounted on the rear end 94 of the second end portion of the shaft means 86. Consequently, the turning of this control wheel will screw the control shaft means inwardly or outwardly depending on the direction in which the control wheel is turned. It will be appreciated that within ordinary mechanical skill, other control means may be used for regulating the longitudinal movement of the control shaft means and the valve means thereby controlling the discharge of fuel from the nozzle means.

A guide member 96 is mounted on the forward or first end 88 portion. of the control shaft means 86 inwardly of the guide member 96 comprises a guide core ltltl which is to be mounted on the control shaft means 86 and a plurality of longitudinal ribs 102 extending from the surface of the core 100 radially outward with respect to its longitudinal axis. As seen in FIGURE 3, these ribs 102 extend outwardly and engage the inner surface d of the tubular sleeve member. Preferably there are at least eight ribs extending from the surface of the core member in order to maintain the position of the guide rigidly within the tubular sleeve member. However, as shown in FIG- URES 5 and 7, the guide member may have a fewer number of longitudinal ribs. In order to achieve the desired rigidity it is necessary to mount the guide member securely on the control shaft means. The core member 100 has a hole 1% extending longitudinally theret-hrough so that the guide member may be slid onto the control shaft means 85 and rigidly secured thereto, as by welding, at the desired position. The control shaft means 86 could also have a seat, as at 105, rigidly secured thereto on which the core member 100 could abut.

As illustrated in FIGURE 3, a valve means 10 3 is mounted on the forward or first end portion 8 8 of the control shaft means 86 and cooperates with the nozzle means 78. Preferably the valve means 108 comprises a cylindrical member 114 axially terminating at one end 11 2 in an integrally connected outwardly flaring frusto-conical member 110. It will be appreciated that the inner surface 107 of the nozzle means 78 can be machined slightly to correspond to the angular trajectory of the frusto-conical member llltl. It is within the scope of the invention to eliminate the cylindrical member 114 and have the valve means 108 comprised of only the frust-o-conical member 110. In this latter case the end 113 of least diameter of the frusto-conical member is positioned adjacent to the guide member 96. The frusto-conical member and the cylindrical member may have axial holes 116 formed longitudinally therethr-ou-gh so as to enable the frustoconical member and the cylindrical member to be slid onto the control shaft means adjacent to the guide member. Securing the valve means 1% on the shaft means by nuts would enable different valve means having different angular trajectory surfaces 118 formed thereon to be placed on the control shaft means and thus the valve means may be separate from the guide member. However, it is preferable to have the guide member and the valve means formed integrally, as shown in FIGURE 4, so as to maintain the proper rigidity. Under these circumstances, it is not necessary to employ nuts so long as the integral valve means and guide members are secured to the shaft, as by welding.

As is shown in FIGURE 1, the angle of trajectory of the surface 118 of a frusto-conical shaped valve memher, that is, the angle of inclination of the surface of the frusto cone with respect to its axis, determines the distance beyond the end of the valve means at which the approximately conically shaped fine spray 120 has a base area 122 corresponding approximately to the cross-sectional area of the dryer. It will be seen that the ignited fine spray is cone-shaped, increasing in diameter as it travels through the combustion chamber. Thus, by increasing the degree of the trajectory of the valve surface, as measured from the valve axis, from 7 to 10, for example, the outer base circumference of the cone of the combustible fuel and air mixture is brought nearer to the entering part 124 of the dryer, thereby allowing the utilization of more heat for drying purposes and less heat to escape out of the dust collector and stack (not shown). It will be appreciated, however, that under other circumstances and taking into consideration, for instance, the fuel used and the moisture content of the material to be dried, it may be desirable for best economy to lessen the degree of trajectory in order to place the base of the fuel spray, once it has assumed the approximate crosssectional area of the dryer, further along the dryer.

In operation, it will be seen that an even and complete mixture of fuel and air outside the nozzle means is achieved by exactly positioning the valve means in relation to the nozzle means, preferably by integrally connecting the valve means to the guide member. Preferably the gate valve aids the valve means in regulating the pressure at which the liquefied petroleum gas is admitted to the atmosphere.

As the liquefied petroleum gas is admitted to the atmosphere, it vaporizes by absorbing heat from the surrounding air, thus lowering the temperature of the fuel and air mixture. It is well accepted that such a fuel and air mixture would be more dense and hence have better heat production potential than a burner which utilizes a vaporizer. A vaporize-r adds heat to the liquefied petroleum gas, just as the instant invention does, but it does not correspondingly cool the surrounding air to reduce the resulting temperature of the mixture.

While a preferred form of the invention has been illustrated in the drawing and discussed above, it should be adequately clear that considerable modification may be made thereto without departing from the principles of the invention. Therefore, the foregoing should be considered in an illustrative sense rather than a limiting sense and accordingly, the extent of this invention should be limited only by the spirit and scope of the claims appended thereto.

What is claimed is:

1. A liquid petroleum burner comprising:

a longitudinally extending first casing means having a rear end portion terminating in a rear transverse end -wall and an oppositely disposed forward portion terminating in a forward end;

a sleeve member slidably mounted within said rear transverse end wall and positioned coaxially within said first casing means and having a rear transverse sleeve end wall and a sleeve forward end oppositely disposed therefrom; said sleeve forward end having a nozzle means formed integrally therewith and extending approximately coextensively with said forward end of said first casing means;

a longitudinally extending second casing means mounted within said first casing means between said first casing means and said sleeve member and extending coaxially with said forward portion of said first casing means forming a passageway between said forward portion of said first casing means and said second casing means, said second casing means having an inner end portion and outer end with said outer end terminating approximately coextensively with said forward end of said first casing means;

air inlet means communicating with the rear portion of said first casing means;

a fuel inlet means communicating with said sleeve member;

a longitudinal control shaft means positioned within and extending coaxially with said sleeve member having first and second end portions;

a frusto-conical valve member mounted on said first end portion of said control shaft means and cooperating with said nozzle means;

a guide member integrally connected to said valve member and mounted on said control shaft means inwardly of said valve member;

control means for regulating the longitudinal movement of said control shaft means and said valve member thereby controlling the discharge of fuel from said nozzle means;

baflle means operatively associated with said second casing means and operatively positioned within said first casing means for regulating the fiow of air through said second casing means and through said passage formed between said first and second casing means; and

means to control the position of said baffle means so as to regulate the amount of air flowing through said second casing means and through said passage.

2. The apparatus as defined in claim 1 wherein said guide member has at least eight longitudinal ribs extending from the surface of said guide member.

3. The apparatus as defined in claim 1 wherein said guide member comprises a cylindrical guide core and a plurality of longitudinal ribs extending from the surface of said guide radially outwardly with respect to its longitudinal axis and engaging the inner surface of said sleeve member.

4. The apparatus defined in claim 1 wherein said nozzle means extends coextensively with said second casing means.

5. A liquid petroleum burner comprising:

a longitudinally extending first casing means having a rear end portion terminating in a rear transverse end wall and an oppositely disposed forward portion terminating in a forward end;

a sleeve member slidably mounted within said rear transverse end wall and positioned coaxially within said first casing means and having a rear transverse sleeve end wall and a sleeve forward end oppositely disposed therefrom, said sleeve forward end having a nozzle means formed integrally therewith and extending approximately coextensively with said forward end of said first casing means;

a longitudinally extending second casing means mounted within said first casing means between said first casing means and said sleeve member and extending coaxially with said forward portion of said first casing means forming a passageway between said forward portion of said first casing means and said second casing means, said second casing means having an inner end portion and outer end with said outer end terminating approximately coextensively with said forward end of said first casing means;

air inlet means communicating with the rear portion f said first casing means;

a fuel inlet means communicating with said sleeve member;

a longitudinal control shaft means positioned within and extending coaxially with said sleeve member having first and second end portions;

a frusto-conical valve member mounted on said first end portion of said control shaft means and cooperating with said nozzle means;

a guide member mounted on said control shaft means inwardly of said valve member having a portion thereof engaging the inner surface of said sleeve memher;

control means for regulating the longitudinal movement of said control shaft means and said valve member thereby controlling the discharge of fuel from said nozzle means;

bafile means operatively associated with said second casing means and operatively positioned within said first casing means for regulating the fiow of air through said second casing means and through said passageway formed between said first and second casing means, said baflie means comprising a tubular member slidably positioned on the inner end portion of said second casing means and having a flaring annular surface at one end of said tubular member, said collar having a surface area approximately equal to the cross-sectional area of said passageway and shiftable from a position blocking said passageway to a position disposed from said passageway; and

means to control the position of said baffle means so as to regulate the amount of air flowing through said second casing means and through said passageway.

6. The apparatus as defined in claim 5 wherein said guide member and said valve member are integrally connected.

7. The apparatus as defined in claim 6 wherein said guide member comprises a cylindrical guide core and a plurality of longitudinal ribs extending from the surface of said guide core radially outwardly with respect to its longitudinal axis and engaging the inner surface of said sleeve member.

8. The apparatus as defined in claim 7 wherein said guide member has at least eight longitudinal ribs extending from the surface of said guide member.

9. A liquid petroleum burner comprising:

a longitudinally extending first casing means having a rear end portion terminating in a rear transverse end Wall and an oppositely disposed forward portion terminating in a forward end;

a sleeve member slidably mounted within said rear transverse end wall and positioned coaxially within said first casing means and having a rear transverse sleeve end wall and a sleeve forward end having a nozzle means formed integrally therewith and extending approximately coextensively with said forward end of said first casing means;

a longitudinally extending second casing means mounted within said first casing means between said first casing means and said sleeve member and extending coaxially with said forward portion of said first casing means forming a passageway between said forward portion of said first casing means and said second casing means, said second casing means having an inner end portion and outer end with said outer end terminating approximately coextensively with said forward end of said first casing means;

a fuel inlet means communicating with said sleeve mema sleeve member slidably mounted within said reartransverse end Wall and positioned coaxially within her; said first casing means and said second casing means, a longitudinal control shaft means positioned Within said sleeve member having a sleeve forward end and and extending coaxially with said sleeve member hava nozzle means integrally formed with said sleeve foring first and second end portions; ward end, said nozzle means extending coex'tensively a frusto-cOnical valve member mounted on said first with said forward end of said second casing means;

end portion of said control shaft means and cooperair inlet means communicating with the rear portion ating With said nozzle means; of said first casing means; a guide member mounted on said control shaft means a fuel inlet means communicating with said sleeve meminwardly of said valve member having a portion thereber; of engaging the inner surface of said sleeve mema longitudinal control shaft means positioned within her; and extending coaxially with said sleeve member control means for regulating the longitudinal movement having first and second end portions;

of said control shaft means and said valve member a frusto-conical valve member mounted on said first thereby controlling the discharge of fuel from said end portion of Said control shaft means and coopnozzle means; erating with said nozzle means; bafile means operatively associated with said second a gu e member mounted on said control shaft means casing means and operatively positioned within said inwar ly of said valve member having a portion first casing means for reg lati the fl of air thereof engaging the inner surface of said sleeve through said second casing means and through said member; passageway formed between said first and second casc ntrol means for regulating the longitudinal movement ing means, said bafile means comprising a tubular of said control shaft means and said valve member member slidably positioned on the inner end portion iiherfiby Controlling the discharge fuel from Said of said second casing means and having a flaring TIOZZIB means; annular surface at one end of said tubular member, baflle means p y associamd With Said Second said collar being movable between an inner position teasing means and p y Positioned Within Said blocking the flow of air through said passageway first casing means fOI' regulating the fl'OW Of air formed between said first and second casing means through Said Second casing means and through the and an outer position adjacent said rear transverse p y formed between Said fi an c nd end wall of said first casing means and blocking the Casing means; and flow of air through id second casing means; d means to control the position of said bafile means so means to control the position of said baffie means so to regulate the amount of air flowing through as to regulate the amount of air flowing through said said Second casing means and through Said p second casing means and through said passageway. y- ]l(). The apparatus as defined in claim 9 wherein said The improvement defined in Claim 12 h in Said guide member and said valve member are integrally c-onguide member and Said Valve member are integ y nected. 40 connected.

11. The apparatus as defined in claim 10 wherein said guide member comprises a cylindrical guide core and a plurality of longitudinal ribs extending from the surface of said guide core radially outwardly with respect to its References Cited by the Examiner UNITED STATES PATENTS 5 1,713,260 5/1929 Chandler 158--76 X gi figj jf and engagmg the Inner surface Sald 2,502,210 3/1950 Demuth 158-76 12. A liquid petroleum burner comprising: I a longitudinally extending first casing means having FOREIGN PATENTS a rear end portion terminating in a rear transverse 11/1920 France end wall and an oppositely disposed forward portion 345,394 12/1921 Germany terminating in a forward end;

a longitudinally extending second casing means mounted within said first casing means and having an inner end portion and outer end with said outer end ter- FREDERICK L. MATTESON, JR., Primary Examiner. EDWARD G. FAVORS, Assistant Examiner. 

1. A LIQUID PETROLEUM BURNER COMPRISING: A LONGITUDINALLY EXTENDING FIRST CASING MEANS HAVING A REAR END PORTION TERMINATING IN A REAR TRANSVERSE END WALL AND AN OPPOSITELY DISPOSED FORWARD PORTION TERMINATING IN A FORWARD END; A SLEEVE MEMBER SLIDABLY MOUNTED WITHIN SAID REAR TRANSVERSE END WALL AND POSITIONED COAXIALLY WITHIN SAID FIRST CASING MEANS AND HAVING A REAR TRANSVERSE SLEEVE END WALL AND A SLEEVE FORWARD END OPPOSITELY DISPOSED THEREFROM, SAID SLEEVE FORWARD END HAVING A NOZZLE MEANS FORMED INTEGRALLY THEREWITH AND EXTENDING APPROXIMATELY COEXTENSIVELY WITH SAID FORWARD END OF SAID FIRST CASING MEANS; A LONGITUDINALLY EXTENDING SECOND CASING MEANS MOUNTED WITHIN SAID FIRST CASING MEANS BETWEEN SAID FIRST CASING MEANS AND SAID SLEEVE MEMBER AND EXTENDING COAXIALLY WITH SAID FORWARD PORTION OF SAID FIRST CASING MEANS FORMING A PASSAGEWAY BETWEEN SAID FORWARD PORTION OF SAID FIRST CASING MEANS AND SAID SECOND CASING MEANS, SAID SECOND CASING MEANS HAVING AN INNER END PORTION AND OUTER END WITH SAID OUTER END TERMINATING APPORXIMATELY COEXTENSIVELY WITH SAID FORWARD END OF SAID FIRST CASING MEANS; AIR INLET MEANS COMMUNICATING WITH THE REAR PORTION OF SAID FIRST CASING MEANS; A FUEL INLET MEANS COMMUNICATING WITH SAID SLEEVE MEMBER; A LONGITUDINAL CONTROL SHAFT MEANS POSITIONED WITHIN AND EXTENDING COAXIALLY WITH SAID SLEEVE MEMBER HAVING FIRST AND SECOND END PORTIONS; A FRUSTO-CONICAL VALVE MEMBER MOUNTED ON SAID FIRST END PORTION OF SAID CONTROL SHAFT MEANS AND COOPERATING WITH SAID NOZZLE MEANS; A GUIDE MEMBER INTEGRALLY CONNECTED TO SAID VAVLE MEMBER AND MOUNTED ON SAID CONTROL SHAFT MEANS INWARDLY OF SAID VALVE MEMBER; CONTROL MEANS FOR REGULATING THE LONGITUDINAL MOVEMENT OF SAID CONTROL SHAFT MEANS AND SAID VALVE MEMBER THEREBY CONTROLLING THE DISCHARGE OF FUEL FROM SAID NOZZLE MEANS; BAFFLE MEANS OPERATIVELY ASSOCIATED WITH SAID SECOND CASING MEANS AND OPERATIVELY POSITIONED WITHIN SAID FIRST CASING MEANS FOR REGULATING THE FLOW OF AIR THROUGH SAID SECOND CASING MEANS AND THROUGH SAID PASSAGE FORMED BETWEEN SAID FIRST AND SECOND CASING MEANS; AND MEANS TO CONTROL THE POSITION OF SAID BAFFLE MEANS SO AS TO REGULATE THE AMOUNT OF AIR FLOWING THROUGH SAID SECOND CASING MEANS AND THROUGH SAID PASSAGE. 